JP3445200B2 - Shoring material transfer device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supporting material moving device for extruding and supporting a supporting material when a bridge superstructure is erected. 2. Description of the Related Art As a method of erection of a bridge superstructure, there is a fixed type shoring method in which a staging is assembled at an erection point, and concrete is cast at that location. In this fixed type shoring method, a shoring is set up for all spans where concrete is to be cast, and a formwork is set on it to manufacture a girder of one span. Since the shoring temporarily supports its own weight until the strength is reached, the shoring is suitable for a structure that does not deform during construction and that is easy to transport, assemble, and disassemble. [0003] As one of the fixed type shoring methods, there is a method of assembling staging of a predetermined height with a column and a shoring beam, and assembling a form shoring thereon. In this format,
First, a pillow beam made of H-shaped steel or the like is placed on a column or a bracket tightly attached to a pier which is erected at a required interval, and then a plurality of main beams orthogonal to this are arranged in parallel in the bridge axis direction. A cross beam perpendicular to the main beam is placed at appropriate intervals. And
A work floor is formed on this cross beam and a form support is assembled. [0004] By the way, when dismantling and removing such support materials, since a bridge superstructure is constructed on the upper part, the removal work cannot be performed unless all members are moved outside from the side of the bridge. For this reason, in the prior art, the cross beams were first pulled side by side and all were removed, and then the main beams were sequentially sent out to the outside of the bridge. At this time, the main beam located on the lower surface of the bridge has been moved laterally by a winch or the like after a rolling support member such as a chill tank has been inserted into the lower surface of the main beam in order to intercept the main beam. [0005] However, in the conventional method of moving the supporting material, the main beam is sequentially sent to the outside of the bridge after the cross beams are drawn one by one as described above, a great deal of work is required for the sending operation. It took time and the work efficiency was poor. SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the above-mentioned conventional supporting material moving device, and is intended to provide a supporting material moving device capable of shortening the pre-working time and having high working efficiency. It is intended to provide. [0007] In order to solve the above problems, a supporting material moving device according to the present invention is a grid frame formed by temporarily fixing intersections of a plurality of cross beams and respective main beams. A pedestal which is provided inside the main beam to be appropriately selected and which is provided with an anti-lifting piece on the lower surface of the upper flange of the bolster to be slidably mounted on the bolster, A jack that is fixed and has a tip portion abutting on the one main beam, and a reaction force surface that is swingably locked to the receiving stand and receives a reaction force of the jack at an upper portion, and a wave that can bite the upper surface of the pillow beam at a lower portion. And a clamp forming a locking surface of the mold. The pillows are placed on a column that stands upright and separated by a required distance, a plurality of main beams orthogonal to the pillows are arranged in parallel in the bridge axis direction, and a plurality of horizontal beams are orthogonal to the main beams. Place. The form support on the cross beam is dismantled and removed in advance, and then the main beam and the cross beam to be intercepted are temporarily fixed with steel connection joints or the like to form an integrated lattice frame. [0009] The supporting material moving devices are installed one by one on the separated pillows, and they are simultaneously operated to move the supporting material formed into the lattice frame while keeping the moving amount constant. I will slide. When the jack is actuated, the reaction surface of the clamp is pushed rearward, and at the same time, the locking surface is pushed against the upper surface of the bolster. At this time, when the corrugated locking surface bites into the upper surface of the bolster, the rearward movement of the cradle is restricted, and a turning force is generated upward around the locking surface. However, since the lifting-preventing piece abuts on the lower surface of the upper flange, the rotation of the receiving stand stops when it slightly floats. Thereby, the reaction force of the jack is obtained by the resistance force by the engagement of the locking surface wave-shaped portion and the restraining force of the lifting prevention piece, and the stroke dividing frame of the jack moves forward. As described above, since the reaction is taken by engaging the locking surface of the clamp with the bolster, the handle is provided above the reaction surface and the clamp is manually rotated when the jack is actuated, so that the clutch is engaged. May be assisted to ensure that the embedding is performed. The jack having the required stroke extended is contracted, the clamp is disengaged and the cradle is slid forward, and the jack is actuated again to take the grid frame. Then, the steel connecting joints of the members moved to the outside from the side of the bridge are removed and sequentially removed. Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 is a side view of the supporting material moving device, FIG. 2 is a cross-sectional view showing a II-II cross section of FIG. 1, and FIG.
FIG. 3 is a plan view of a supporting material in which a supporting material moving device is arranged. The supporting material 1 is a member for constructing a bridge superstructure, for example, a PC girder 2 by cast-in-place concrete, and a pillow to be placed on a supporting column 3 erected at required intervals with an auxiliary steel material 3a or the like interposed therebetween. It is composed of a beam 4, a plurality of main beams 5 arranged in parallel in the bridge axis direction perpendicular to the bolster beams 4, and a plurality of cross beams 6 mounted perpendicular to the main beams 5. The supporting material moving device 7 includes a cradle 8, a hydraulic jack 9 mounted on the cradle 8, and a clamp 1 receiving the reaction force.
0. The cradle 8 is composed of two side plates 1 having a substantially L-shaped cross section.
A box body is formed by the bolt nuts 1 and 11 and the bolt nuts 12 and 13 connecting these upper and lower portions, respectively, and the lower bolt nut 13 can be inserted into a rotatable tube 13a and slidable on the bolster 4. Configuration. The opposite bent portion at the lower end of the side plate 11 forms a lifting prevention piece 11a, and holds the upper flange 4a of the bolster 4 with the tube 13a. The cradle 8 can be detached from the bolster 4 by loosening the bolts and nuts 12 and 13, and can be mounted on a new bolster by tightening the bolts and nuts. A hydraulic jack 9 mounted on the bolt nut 12 is located between two angle irons 9a, 9a similarly fixed on the bolt nut 12, and is fixed by a holding band 9b through which the angle iron 9a is inserted and a nut 9c. Is done. In addition,
This fixing degree is loosely fixed so that the hydraulic jack 9 can move back and forth. The clamp 10 has a reaction force plate 10b connecting the upper portions of two plate members 10a, 10a each having a substantially "L" shape on the side surface, and a shaft 10c is fixed to a substantially center of the plate member 10a. Is loosely inserted into the side plate 11 of the receiving stand 8 so as to be swingable with respect to the receiving stand 8. On the lower surface of the plate body 10a, a corrugated locking surface 10d that can bite the upper surface of the bolster 4 is formed.
A handle 14 is provided above b. The supporting material moving device 7 is installed one by one on each of the two pillow beams 4, 4 which are separated from each other, and presses the main beam 5 via the square members 15. As shown in the illustration of the movement of the supporting material in FIG. 4, after placing the concrete of the PC girder 2, the form support (not shown) on the cross beam 6 is dismantled and removed in advance, and then the main beam 5 and the cross beam 6 to be traversed are removed. Temporarily fixed with steel connection joint 16
The lattice frame 17 integrated above is formed. The supporting material moving device 7 is installed inside one main beam 5 of the lattice frame 17 which is appropriately selected, and the support frame moving device 7 is slid on the pillow 4 while keeping the moving amount of the lattice frame 17 constant. Here, the operation of the supporting material moving device 7 will be described. When the hydraulic jack 9 is actuated, the reaction force plate 10b of the clamp 10 is pushed rearward, and at the same time, the locking surface 10d of the plate 10a is pressed against the upper surface of the bolster 4. At this time, if the corrugated locking surface 10d bites into the upper surface of the bolster 4, the rearward movement of the cradle 8 is restrained, so that the upward rotating force with the locking surface 10d as a fulcrum is generated. Occurs. However, since the floating prevention piece 11a comes into contact with the lower surface of the upper flange 4a, the rotation of the receiving table 8 stops when the floating slightly rises. As a result, the reaction force of the hydraulic jack 9 is obtained by the resistance force caused by the engagement of the corrugated portion of the locking surface 10d and the frictional resistance force of the lifting prevention piece 11a, and the lattice frame 17 moves forward. become. Since the supporting material moving device 7 can increase the propulsive force of the hydraulic jack 9, it is not necessary to interpose a sliding member between the main beam 5 and the bolster 4 to reduce frictional resistance. When the jack is operated, the handle 14 is manually assisted and the locking surface 1 is pressed.
Biting to 0d is performed reliably. Hydraulic jack 9 with required stroke extension
Releases the hydraulic pressure to automatically disengage the clamp 10 and slide the cradle 8 forward. The hydraulic jack 9 is operated again by the above process, and the grid frame 17 is moved to a position where the main beam 5 at the end is separated from the bolster 4 as shown in FIG.
Intercept. The main beam 5 at this end is hung by a lifting device (not shown), and the steel connecting joint 16 at the main beam is removed and removed. The above operation is repeated, and the supporting material moving device 7
Are sequentially removed up to the main beam 5 in one row in front of the main beam 5 directly pressed. In FIG. 5, the main beams 5 up to the third row are removed. At this point, the center of gravity of the entire lattice frame 17 needs to be located behind the supporting material moving device 7. Next, the lattice frame 17 is further extruded, and
, Ie, the center of gravity of the protruding cross beam 6 is located outside the overhang of the PC girder 2. At this position, the cross beams 6 are suspended one by one by a lifting device, and the steel connecting joints 16 at the cross beams 6 are removed and sequentially removed. Since such a work process is performed, it is desirable that the initial installation position of the supporting material moving device 7 be installed behind the main beam 5 at the point where the cross beam 6 is suspended. When the removal of the cross beams 6 is completed, the main beam 5 at the forefront is removed, and the supporting material moving device 7 is rearranged behind the rear main beam 5, and the rear main beam 5 is pushed out. It moves to the position shown in FIG. 7 while taking in the main beam 5 in front. While taking over and removing the main beam are repeated as appropriate, the last main beam 5 is finally removed to complete the work. As described above, the supporting material moving device according to the present invention is provided with a lifting-preventing piece protruding therefrom and a pedestal that is slidably mounted on a pillow and a counter of a jack. Since a clamp that can bite into the upper surface of the pillow beam while receiving the force is provided, the grid frame formed by temporarily fixing the intersections of the plurality of cross beams and the main beams can be pushed out by the jacking propulsion force and taken out. In addition, it is easy to change the work, so it is possible to shorten the pre-working time,
It becomes possible to move the supporting material with high working efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a supporting material moving device. FIG. 2 is a sectional view showing a II-II section in FIG. 1; FIG. 3 is a plan view of a supporting material in which the supporting material moving device is arranged. FIG. 4 is an explanatory view at the beginning of the transfer of the support material. FIG. 5 is an explanatory view when the main beam in the first row is removed. FIG. 6 is an explanatory view when a cross beam is removed. FIG. 7 is an explanatory view at the time of removing a tail main beam. [Description of Signs] 1 Supporting material 2 PC girder 3 Supporting column 4 Pillow beam 5 Main beam 6 Cross beam 7 Supporting material moving device 8 Cradle 9 Hydraulic jack 10 Clamp 10a Plate body 10b Reaction plate 10d Locking surface 11 Side plate 11a Floating prevention piece 17 lattice frame

Claims (1)

(57) [Claims] [Claim 1] A pillow beam to be placed on a column that stands upright at a required interval, and a plurality of main beams that are orthogonal to the pillow beam and are arranged in parallel in the bridge axis direction; In a supporting material moving device for moving and dismantling a supporting material consisting of a plurality of cross beams placed orthogonally to the main beam from the side of the bridge after placing concrete in the superstructure, Properly select a lattice frame to be formed by temporarily fixing each intersection point of each main beam. A receiving table slidably mounted thereon, a jack fixed on the receiving table and having a tip portion abutting against the one main beam, and a reaction force of the jack being slidably locked to the receiving table and upwardly; And a clamp forming a corrugated locking surface which is provided with a reaction force receiving surface and which can bite the upper surface of the bolster beam below. The mobile device.